Thanks for the responses. I don't care too much on mpg really just estimating costs. My zj gets about 11-12mpg as it is :P
That hemi mpg drop seems really high... I don't understand how the v6 had a small drop compared to your hemi?
95 zj Laredo, 249tc, 206k miles, 5.2L v8, KOR light bar, Kenwood BT555U Head unit